As a second year high school student, I, Kotaro Yagami, was planning to spend my days as normal as ever. But that day, a new student arrived in my class, and that new student was my childhood friend, Tsukishima Yui, whom I prommised to marry a long time ago. It was when we were kids, so I’m sure she’s forgotten about it….? But she remembered and confessed her love for me in front of everyone There was also some kind of unsettling atmosphere with Asuka Shirakawa, who was in the same club…… It seems that my peaceful school life came to an end on this day.